Upper radiator hose suggestion

[GMC69]

I have a 1970 C20 with a 396 BB in it. I just received a Vintage Air sure-fit AC system for it. I have the alternator mounted on the passenger side and the power steering on the driver’s side. I am mounting the compressor on the driver’s side also and as per their instructions, I purchased a new radiator hose that was supposed to help clear the compressor.

The part number they suggest is GM # 3986380 ( Napa 7575 ).

I installed it and even cut the radiator side a bit shorter but it still doesn’t clear the compressor. Does anyone have a suggestion on another hose I could use that might have a 90 degree bent as soon as it exits the rad?

I have attached a couple of pictures showing how the hose comes out currently.

[bs46488]

I used one when I had a Big Block from a 1971 Chevelle. Part number from my local Autozone is E70724

[RustyPile]

Sometimes cross over parts aren't exact duplicates of original and other brands have to be compared. I have a 454 BBC in my '71.. Top hose is a Gates 20827.. The bend is less than 90 degrees, turns back toward the radiator somewhat.. Runs a ways then turns back toward the t-stat housing.. I don't have any pictures of the installation but the bend at the radiator neck on my Gates is much sharper and has a shorter radius than your NAPA hose..

[GMC69]

Originally Posted by bs46488

I used one when I had a Big Block from a 1971 Chevelle. Part number from my local Autozone is E70724

I seen a number for a chevelle big block and the pictures showed a sharper bend. I will look up this number and might try it.

Thanks

[GMC69]

Originally Posted by RustyPile

Sometimes cross over parts aren't exact duplicates of original and other brands have to be compared. I have a 454 BBC in my '71.. Top hose is a Gates 20827.. The bend is less than 90 degrees, turns back toward the radiator somewhat.. Runs a ways then turns back toward the t-stat housing.. I don't have any pictures of the installation but the bend at the radiator neck on my Gates is much sharper and has a shorter radius than your NAPA hose..

This hose is a continental or gates. The Napa number was what was suggested by vintage air. The Napa part was 36$ this hose was 21$.

[RustyPile]

Originally Posted by GMC69

This hose is a continental or gates. The Napa number was what was suggested by vintage air. The Napa part was 36$ this hose was 21$.

Doesn't matter who made your hose or how much it cost.. The hose in your picture looks nothing like my Gates 20827.. Mine clears the compressor -- yours doesn't..

[lutronjim]

Gates 25808 1 1/2” is a flex hose with 90 at one end. I used it with Gates 26390 1 1/2” to 1 1/4” reducer for upper hose on mt LC9.

[GMC69]

Originally Posted by RustyPile

Doesn't matter who made your hose or how much it cost.. The hose in your picture looks nothing like my Gates 20827.. Mine clears the compressor -- yours doesn't..

The actual Napa 7575 is most likely made like your Gates 20827. The parts store here just used the interchange number since it isn’t a Napa store and that’s how I got one that is made by someone else and it doesn’t work, plus this was the only store that had a hose in stock. The Napa store didn’t stock the 7575 so I couldn’t even look at it to see.

Now I have a few more numbers to go back to a couple of parts stores with and see what happens.

I could order a hose online, but I’m trying to buy as much locally as possible.

[rpmerf]

https://www.rockauto.com/en/catalog/...pper+hose,2058

https://www.rockauto.com/en/partsearch/?partnum=20827

I can see 20607 on the hose in your pictures. Looks likes the Gates 20607.

The Dayco 70724 has a nice 90. The Gates 20827 looks similar

[GMC69]

Originally Posted by rpmerf

https://www.rockauto.com/en/catalog/...pper+hose,2058

https://www.rockauto.com/en/partsearch/?partnum=20827

I can see 20607 on the hose in your pictures. Looks likes the Gates 20607.

The Dayco 70724 has a nice 90. The Gates 20827 looks similar

Yes, thanks to the replies in here, I have a few numbers to look at. Being in Canada, I’m trying to avoid ordering cross border.

The 2 groove press fit pulley I need I was going to order from rock auto as it was the cheapest option. I called one of the local parts stores and it was the same price, after including shipping from rockauto.

[kwmech]

I'd look into swapping sides with the ac and alt

[GMC69]

Originally Posted by kwmech

I'd look into swapping sides with the ac and alt

Finding a hose will be easier. I would need other brackets plus I just received the proper hose kit for the compressor.

[Grumpy old man]

Have you considered stopping by your local muffler shop and having a piece of pipe bent so it fits perfectly and being so close to that A/C pulley may save you problems down the road ?

[GMC69]

I’m going to investigate the suggestions for part numbers first. They may just work. If not, then I’ll dig into other options.

[HO455]

I'm not sure if this will help but there are at least two styles of thermostat housings, one is straight and one that is angled to the drivers side. They have different hoses. Here is a link to my Burban's SMALL BLOCK showing the difference in the two hoses (Post 344).

http://67-72chevytrucks.com/vboard/s...698377&page=14

I can't tell which housing you have but if you can't get it to work maybe the other style would work better. I had to trim my upper hose shorter at the radiator to get it to work for me.
Good luck

[GMC69]

Originally Posted by HO455

I'm not sure if this will help but there are at least two styles of thermostat housings, one is straight and one that is angled to the drivers side. They have different hoses. Here is a link to my Burban's SMALL BLOCK showing the difference in the two hoses (Post 344).

http://67-72chevytrucks.com/vboard/s...698377&page=14

I can't tell which housing you have but if you can't get it to work maybe the other style would work better. I had to trim my upper hose shorter at the radiator to get it to work for me.
Good luck

I’m not sure how different the small bloc is from the big block, but this is possibly another option.

Thanks.

[Shinysideup]

I dont know if it helps but heres a thread showing going the other way round,see if it helps? looked tight in front of pullies!
http://67-72chevytrucks.com/vboard/s...d.php?t=723941

[GMC69]

With the rad that I have and the big block arrangement I’m using, if you look at one of the last pictures, you will see the rad exits almost straight into the compressor. Once I adjust it to tighten the belts it will be directly in front of it.

[Willys47]

I have a bbc in my 68 GMC and the rad hose came with the motor whitch was out of a 1975 chevy 1 tone. It has a tight turn at the inlet hose to the rad and runs parrallel to the rad it might be what you need.

[roboticjunky]

Could try this upper hose for a 87 Chevy V10 pick-up, it had A/C on driver side and alternator on passenger side. CONTINENTAL 61564

https://www.rockauto.com/en/moreinfo...300868&jsn=457

[GMC69]

I stopped in at one of the parts stores and ordered another hose. 70724.

I checked his screen and it looked correct. Went back this morning to pick it up along with some belts.

A little trimming and now there’s lots of room.